After buying a Glock 43, I undertook sighting it in soon as I could get to my range. I found that my POI versus POA was about 1.5" low, with most ammo. So I replaced the 6.1 rear sight that comes on it with the Glock 6.5 height , made for the 9mm compact series . Aiming at 6 o'clock on a 3" target dot , I,m getting a center hit . Target shown has 2 hits in center and 3 around making a 1'' group. Ammo was WW Box 115 FMJ. BTW , you will have to shave a slight amount of each side of the poly sight to make it look like it fits , since the 6.5 mm sight is slightly wider to fit 19 & 23 size slide width dovetail. Distance was 32 ' and off a plastic pipe rest under wrist .